DIY Serial Mini Terminal info

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willtoolman
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DIY Serial Mini Terminal info

Post by willtoolman » Mon Feb 10, 2014 5:52 pm

I have not been able to locate the blog with the info for making the Serial mini terminal. As I have a purpose specific and a nice enclosure your version does not fit my needs. All I really need is the schematic just to be sure i get the switches and LCD wired to the right pins.

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joepardue
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Re: DIY Serial Mini Terminal info

Post by joepardue » Mon Feb 10, 2014 6:47 pm

Interesting... that's the second request today.

I've recently updated the materials for the Arduino Handheld Prototyper. You can find all six articles, the source code, and instructional videos on how to construct the terminal part of the device. You can find them at:
https://store-jwm4nhbo.mybigcommerce.co ... typer-kit/

Thanks for the interest,
Joe

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Re: DIY Serial Mini Terminal info

Post by willtoolman » Tue Feb 11, 2014 3:03 pm

Am I not looking deep enough? i Still cannot find the schematics for the mini terminal?

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joepardue
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Re: DIY Serial Mini Terminal info

Post by joepardue » Tue Feb 11, 2014 6:11 pm

Well that was weird - I just looked through all the figures and no schematic!

So here it is:Image

Along with my apologies for the confusion.

Joe

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Re: DIY Serial Mini Terminal info

Post by willtoolman » Tue Feb 11, 2014 6:48 pm

Thank You much.

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joepardue
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Re: DIY Serial Mini Terminal info

Post by joepardue » Wed Feb 12, 2014 5:32 am

You are welcome. And, by the way, I show an Atmega8 but I use an Atmega328P.

Joe

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Re: DIY Serial Mini Terminal info

Post by willtoolman » Wed Feb 12, 2014 3:12 pm

yep i got some 328P's, i think, they say 328-PU. i hope that is the same. also i was looking over the schematic and noticed that you did not use any resistors on the buttons like you did with the LCD Navigator and thought that was a bit curious. the only logic i could come up with was as you were planning this as a kit with a stand alone PC board and I2C comms that it was safe to just use the internal resistors??

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joepardue
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Re: DIY Serial Mini Terminal info

Post by joepardue » Wed Feb 12, 2014 3:31 pm

328-PU and 328P are not the same thing and cause no end of trouble when programming since they have different serial numbers
so avrdude won't recognize the 328-PU if you've set it for 328P.

And the resistors were to make the LCD Navigator more robust for folks who inadvertantly programmed the button input pins as
outputs and the raised them to +5 and then pressed the button to GND. I figured that on the I2C Mini Terminal that I wouldn't make that
mistake and could save the time and money by eliminating the extra resistors. The I2C Mini Terminal does have the optiboot bootloader and
can be programmed by the user, but I figured (hoped) that anyone doing that wouldn't make the error.

I hope you find the system useful.

Joe

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Re: DIY Serial Mini Terminal info

Post by willtoolman » Wed Feb 12, 2014 3:54 pm

ok, thanks again for the help. i may be contacting you again or go buy the correct 328P. if i make good progress i will send you a pic and overview of what i have it doing.

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